Flowserve Uniseal Series BW Seals - Manual (Page 7)

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3.5 For dual unpressurized (tandem seal) operation, supply a clean,
compatible buffer fluid at a pressure below the seal chamber pressure.
The pressure in the seal chamber must not exceed the recommended
maximum pressure.
3.6 Dual seal recommendation: For enhanced seal performance and
reduced coking, use DuraClear as a barrier fluid. Refer to DuraClear
brochure FSD123 or contact a Flowserve representative for further details.
4 Operational Recommendations
4.1 Remove lock outs on equipment and valves.
4.2 Do not start up the pump dry to check motor rotation or for any other
reason. Open valves to flood pump with product fluid. Ensure that the seal
flush or support system is operating. Vent air from the casing of the pump
and the seal chamber before start-up.
4.3 Observe the start-up. If the seal runs hot or squeals, check the seal flush
system. Do not allow the pump to run for any extended time if the seal
gets hot or squeals.
4.4 Do not exceed corrosion limits. The Uniseal is designed to resist
corrosion through proper material selection. Do not expose the Uniseal
materials of construction to products outside of their corrosion limits.
Consult Flowserve for chemical resistance recommendations.
4.5 Do not exceed pressure and speed limits established for the Uniseal.
4.6 Do not exceed the temperature limits of the Uniseal based on the
materials of construction. For dual seals using supply tanks with cooling
coils, turn on cooling water to the supply tank before start-up.
4.7 Do not start up or run the Uniseal dry. The seal chamber, pump and
support systems should be thoroughly vented before start-up. Buffer or
barrier fluid must flood the seal cavity of dual seals at all times during
operation. Process fluid must be in the seal chamber at all times during
single seal operation.